Tool-holder



W` S. WHYTE.

TOOL HOLDER;

APPLICATION FILED 00T. 4, I9I9.

'Patented De@ 2L i920.

UNITED STATES PATENT OFFICE.

WILLIAM SIDNEY WHYTE, OF BEDFORD, INDIANA.

TOOL-HOLDER.

To all whom t may concern:

Be it known that I, WILLIAM SIDNEY VHYTE, a citizen of the United States, and a resident of Bedford, in the county of Lawrence and State of Indiana, have invented certain new and useful Improvements in Tool-Holders, of which the following is a specification.

My invention relates to devices associated with pneumatic operated tools for holding the latter sovthat the tool may be operated without transmitting its motion to the hands of the operator, whereby injury to the operator and other attendant disadvantages are eliminated.

yIt is the purpose of my invention to provide aholder of the above described character which is extremely simple in construction and which effectively absorbs all shocks and jars of the tool so as to efficiently prevent injury to the operator.

I will describe one form of holder embodying my invention and will then point out the novel features thereof in claims.

In the accompanying drawings:

Figure 1 is a view showing a conventional form of pneumatic hammer and tool. to which latter is applied, one form of holder embodying my invention;

Fig. 2 is a longitudinal sectional view of the holder shown in Fig. 1 in applied position upon a tool;

Fig. 8 is a transverse sectional view, taken on the line 3-3 of Fig. 2;

Fig. 4 is a fragmentary view showing in bottom plan the holder shown in the preceding views; and

Fig. 5 is a fragmentary view showing in side elevation a portion of the tool shown in Figs. 1 and 2.

Similar reference characters refer to similar parts in each of the several views.

Referring specically to the drawings, and particularly to Fig. 1, A designates a pneumatic hammer of any conventional form to which air is supplied through a flexible pipe B. L designates generally a tool which is adapted to be operated by the pneumatic hammer A, such tool in the present instance being a chisel having a squared shank 15 and an extension 16 which is adapted to be inserted into the pneumatic hammer A. 17 designates the head of the chisel.

The holder which forms the subject-matter of my invention, comprises, in the pres- Specication of Letters Patent.

Application filed October 4, 1919.

Patented Dec. 21, 1920.

Serial No. 328,564.

ent instance, a seamless casing K which is formed of metal and is preferably of tubular formation. As shown in Figs. 1 and 2, the casing K surrounds the shank 15 of the tool L and is maintained in spaced relation thereto by bushings or collars S and S interposed between the tool and casing adjacent the opposite ends of the latter. As shown in Fig. 2, the bushing S threadedly engages the inner wall of the casing and may be locked in this position by a screw 18. The bushing S is provided with a squared opening to receive the shank 15 and a hub portion 19 which embraces the shank and serves as a reinforcement for the bushing. The bushing S does not threadedly engage the inner wall of the casing but snugly fits therein and is locked against displacement by a screw 18a. the bushing S is also formed with a squared opening to receive the shank 15, and with the bushings S and S arranged in this manner the casing K is slidably associated with the tool but is locked against circumferential movement on the tool. The screws 1S and 18'"L are further utilized to secure bands 20 and 21, respectively, which surround the casing` K at the opposite ends thereof. Interposed between the bands 20 and 21 and the casing K is a cover C which completely envelops the casing and is preferably formed of asbestos to prevent the transmission of heat from the tool to the hands of the operator.

As shown in Fig. 2, the casing K is interiorly provided with a positioning collar P of circular contour so as to slide within the casing. The collar P is also formed with a squared opening to receive the shank 15 of the tool, and such collar is locked to the shank by means of a set screw W which is threaded within the collar and has a pointed end which bears within a recess 15 formed in the shank. To allow the manipulation of the set screw W and to permit a restricted movement of the collar P within the casing, the casing and cover C are formed with slots 22, as clearly shown in Fig. 4.

Interposed between the collar P and the bushings S and S are a pair of coiled retractile springs R and R', such springs surrounding the shank 15 of the tool and serving to bias the collar P to a point centrally of the casing K. Asthe collar P is locked to the tool L, it will be obvious that the t will be understood that holder as a unit is biased to a predetermined position with respect to the tool.

ln the1 operation ofv the-tool, itrapidly re' ciprocates under the action of the pneumatici engagingY ythe opposite-endwvalls otlthe slot 22. ,als vwill:bev-understood, the springs R and R absorb this limited movement oi the` cellar P sothat in effect the casingl `re-Y mainssubstantially stationary diiringthe movement ot' the-'tool so that none of the shocks or vibrations oic ythe tool -aretransinitted to the hands of ythe operator.

` lt Wilf.- be manifestwthat the-application removal rof; the holder from the tooll or may be readily effected by Withdravvingthe set screw frenar the notch 15rl thereby permitting` the=holder to be slid from the tool when thelatter-fis detached 'from the pneumatic hammer. n order to facilitate the application of the holder to the tool, I previde the shank .l5 at a point adjacent the head l? ,witha iiange which serves as a positioning` member te prevent the tool 'freni beingiiisei ted too far into the holder, it bein;` understoodl that the flange abuts the bn shin g l, S.

although l 4`haveherein shown and. de scribed only one iform of holder embodying` my invention7 it is te be'understood that various:v changes `and modifications may be made herein Without departing` from the spirit` of the invention and the spirit and scope of the appended claims.

Having' thus Adescribed my inventionj I claim:

l. lin combination, a tool having a squared shank, and a holder removably associated with-the `tool' andconiprising a casing surrounding the tool, bushings removably fitted Within the casing and having' squared openings to receive said shank, a collar slidable Within the casing, a set screw carried by said collar andqengaging said shank, said casing being` formed with a slot to receive said screW-andfto limit themovement of said .collariivith respect te said casing, and springs interposed between said coi lar 'andV said 'bushings tor the purpose described.

2. A tool holder comprising casing, bearings,removably associated with the opposite ends of said casing, a collar slidable in the casingY springsinterposed Ybetween saidbushings and'collar for biasing the latter-centrally of the casing, said bushings and collarI being formed with openings Ywhich are adapted to sl'idably receive a tool7 and means carried byv said collar and engaging said casing` forlimiting the rmovement of the collar within the casing, said ineans being adapted to loclrthe collar to a tool inserted Within the casing.,

3. A shock absorbinghandle comprising a sleeve, a shankvmounted to slide in the sleeve, a collar connected With the shank W'thin the sleeve, a connection between the collar andthe sleeve permitting the collar to move longitudinally of the sleeve and preventing relative rotation of vthe sleeve and the shank, a coil spring encircling` the shank on each side of the lirst named'collai` and means at each end of the sleeve for engagging the outer end of 'each spring` respectivel f.

VILLIAM .SIDNEY VHYTE. 

